Kate took part in Miss Russia 2012, where she represented Murmansk Oblast and placed among the top 10 finalists. Later in 2012, she applied for the fourth cycle of Top Model po-russki, the Russian adaptation of America's Next Top Model, along with her sister Valentina, where she was runner-up to Yulia Farkhutdinova, with her sister placing third.
Grigorieva was soon signed to modeling agency ZMGROUP. After her appearance in Top Model po-russki, modeling agency The Lions displayed interest in signing her. This eventually led to Grigorieva's stage debut at New York Fashion Week in 2014, opening for Donna Karan as a semi-exclsuive, as well as walking for Shiatzy Chen, Oscar de la Renta, Tory Burch and Ralph Lauren.
Kate was chosen by top modeling site models.com as one of the top newcomers of the Fall/Winter 2014 season, and has since walked for Givenchy, Versace, Gucci, Dolce & Gabbana, Céline, Isabel Marant, Nina Ricci, Elie Saab, Roberto Cavalli, Alexander McQueen, Balmain, Giambattista Valli, Emanuel Ungaro, Moschino, Etro, Missoni, Emilio Pucci and others.
Grigorieva opened for the 2015 Spring/Summer collections of DSquared2 and Stella McCartney. She has shot ad campaigns for M Missoni, H&M, Moncler Gamme Rouge shot by Steven Meisel and Versace eyewear. She has appeared in catalogs for Victoria's Secret, and has also been featured in editorials of numerous magazines including several national editions of Vogue, Contributor, i-D, Pop, and Numéro.
On 2 December 2014, Grigorieva made her debut at the Victoria's Secret Fashion Show 2014 along with fellow Miss Russia contestant and model, Irina Sharipova.
In October 2015, Grigorieva was ranked by Cosmopolitan as one of the most successful contestants of the Top Model franchise.
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She was supposed to walk in the 2017 Victoria's Secret Fashion Show, but days before the show, her visa to travel to China was rejected, along with several models, which prevented her from walking the show.
Yekaterina "Kate" Sergeyevna Grigorieva was born in Olenegorsk on 15 September 1989 to a military family, Grigorieva studied at the Murmansk State Technical University, majoring in marketing.